There’s no denying that director M. Night Shyamalan’s filmmaking career has been polarizing, with movies in the quality range of The Sixth Sense to, somehow also,After Earth. Of course, if there’s a calling card to Shyamalan’s directorial style, it’s his propensity for third act twists that can flip a movie on its head. That’s what makes The Sixth Sense so iconic.

To that end, his controversial film Split is quintessential Shyamalan, with a final twist that puts the entire narrative in a whole new light and adds exciting possibilities for a sequel. The twist is perhaps worth the price of admission in and of itself, but here, we can discuss it in length. Just, seriously, don’t read on if you don’t want this twist spoiled — it’s actually quite clever.